Terror star bugs.
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Stardock Forums
I've encountered a bug when using terror stars in fleets. If you create a fleet with a terror star and some regular ships in it, save your game, then reload the saved game, that fleet will now be capable of moving at the speed of the regular ships, instead of being limited to the speed of the terror star. It also sometimes creates some other strange behavior relating to the movement of the fleet that I can't quite come up with how to describe.
In addition, when you do this, the terror star appears to be able to attack ships in orbit, destroying them instantly, and then destroying the star system. (I'm assuming that the correct behavior for terror stars is that they can't attack ships, and can't destroy systems containing ships, since that's how the work without the fleet bug.)
In addition, when you do this, the terror star appears to be able to attack ships in orbit, destroying them instantly, and then destroying the star system. (I'm assuming that the correct behavior for terror stars is that they can't attack ships, and can't destroy systems containing ships, since that's how the work without the fleet bug.)